/usr/include/KF5/KWayland/Server/ is in libkf5wayland-dev 4:5.44.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/KF5/KWayland/Server/appmenu_interface.h
/usr/include/KF5/KWayland/Server/blur_interface.h
/usr/include/KF5/KWayland/Server/buffer_interface.h
/usr/include/KF5/KWayland/Server/clientconnection.h
/usr/include/KF5/KWayland/Server/compositor_interface.h
/usr/include/KF5/KWayland/Server/contrast_interface.h
/usr/include/KF5/KWayland/Server/datadevice_interface.h
/usr/include/KF5/KWayland/Server/datadevicemanager_interface.h
/usr/include/KF5/KWayland/Server/dataoffer_interface.h
/usr/include/KF5/KWayland/Server/datasource_interface.h
/usr/include/KF5/KWayland/Server/display.h
/usr/include/KF5/KWayland/Server/dpms_interface.h
/usr/include/KF5/KWayland/Server/fakeinput_interface.h
/usr/include/KF5/KWayland/Server/filtered_display.h
/usr/include/KF5/KWayland/Server/global.h
/usr/include/KF5/KWayland/Server/idle_interface.h
/usr/include/KF5/KWayland/Server/idleinhibit_interface.h
/usr/include/KF5/KWayland/Server/keyboard_interface.h
/usr/include/KF5/KWayland/Server/kwaylandserver_export.h
/usr/include/KF5/KWayland/Server/output_interface.h
/usr/include/KF5/KWayland/Server/outputchangeset.h
/usr/include/KF5/KWayland/Server/outputconfiguration_interface.h
/usr/include/KF5/KWayland/Server/outputdevice_interface.h
/usr/include/KF5/KWayland/Server/outputmanagement_interface.h
/usr/include/KF5/KWayland/Server/plasmashell_interface.h
/usr/include/KF5/KWayland/Server/plasmawindowmanagement_interface.h
/usr/include/KF5/KWayland/Server/pointer_interface.h
/usr/include/KF5/KWayland/Server/pointerconstraints_interface.h
/usr/include/KF5/KWayland/Server/pointergestures_interface.h
/usr/include/KF5/KWayland/Server/qtsurfaceextension_interface.h
/usr/include/KF5/KWayland/Server/region_interface.h
/usr/include/KF5/KWayland/Server/relativepointer_interface.h
/usr/include/KF5/KWayland/Server/resource.h
/usr/include/KF5/KWayland/Server/seat_interface.h
/usr/include/KF5/KWayland/Server/server_decoration_interface.h
/usr/include/KF5/KWayland/Server/server_decoration_palette_interface.h
/usr/include/KF5/KWayland/Server/shadow_interface.h
/usr/include/KF5/KWayland/Server/shell_interface.h
/usr/include/KF5/KWayland/Server/slide_interface.h
/usr/include/KF5/KWayland/Server/subcompositor_interface.h
/usr/include/KF5/KWayland/Server/surface_interface.h
/usr/include/KF5/KWayland/Server/textinput_interface.h
/usr/include/KF5/KWayland/Server/touch_interface.h
/usr/include/KF5/KWayland/Server/xdgforeign_interface.h
/usr/include/KF5/KWayland/Server/xdgshell_interface.h